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Model 845 | Low-Phase-Noise Microwave & RF Signal Generator (9 kHz–26.5 GHz)
Berkeley Nucleonics has designing and engineering precision RF and microwave instruments for over 60 years. The Model 845 is a versatile RF microwave signal generator that combines ultra-low phase noise, fast switching, and broad frequency coverage making it a dependable choice for engineers working across VLF through K-band applications.
- Wide Frequency Range: Continuous coverage from 9 kHz to 26.5 GHz (available in 12 GHz, 20 GHz, and 26.5 GHz models) with sub-Hertz resolution for precise tuning.
- Exceptional Signal Purity: Advanced fractional-N synthesis delivers low SSB phase noise and high spurious suppression.
- Accurate Power Control: Wide, leveled output power range with excellent linearity.
- Fast & Responsive Operation: Quick frequency switching paired with an intuitive touch-screen display for efficient bench or automated use.
- Customizable Configurations: Tailor the instrument with a variety of options (modulation, interfaces, enclosures, and more) to match your exact requirements.
A low-noise microwave RF signal generator supports critical applications including radar and electronic warfare development, satellite communications, 5G/6G component validation, phase-locked loop testing, and high-frequency research. Its combination of spectral cleanliness, fast agility, and customization flexibility makes it especially valuable when signal quality and repeatability are non-negotiable.
Applications
- R&D Low Noise signal source
- Product Testing
- Service and maintenance
- Signal simulation
- Aerospace & Defense
- Installation and Maintenance
- Radar Receiver Testing
Features
- High Output Power
- Low Phase Noise
- Comprehensive AM, low-distortion, wideband DC-FM, and high-speed pulse modulation
- Powerful Trigger and Sweeping modes
- Portable battery operation
Model 845 SIGNAL SOURCE CONFIGURATOR
| Frequency Range: | 12 GHz 20 GHz 26 GHz |
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| Options: | [-HP] High Output Power *[Contact Factory for a power higher than +25dBm] [-FS] Fast Switching [-9K] 9kHz Frequency Extension **[] [-PE3] Power Extension down to -90dBm (Mechanical Step Attenuator) [-EB6] External Battery Bank to 6V Adapter [-NP] Narrow Pulse (30ns minimum PW and 5ns Resolution) [-FLASH] MicroSD card slot for removable SD memory [-GPIB] GPIB Communication Port [-1URM] 19" 1U Rackmount Chassis [-FILT] Improved Harmonic Filtering [-REAR] Move Output to Rear (*Requires Rackmount Chassis -1URM) [-OEM] Board Level Package (see also 845-OEM) |
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| Accessories: | 19" 3U Single/Dual Rackmount Kit for Desktop Chassis [P/N 7091] Spare Power Supply [P/N 7134] Ruggedized Protective Bumper [P/N 7144] |
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Model 845-20
100kHz - 20GHz Microwave/RF Signal Generator
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Frequency Range
845-12: 9 kHz to 12 GHz
845-20: 9 kHz to 20 GHz
845-26: 9 kHz to 26.5 GHz
Resolution: 0.001 Hz
Power
Range: -20 to +15 dBm (-90 to +25 dBm with option PE3 and HP)
Resolution: 0.01 dB
Switching Speed
400 µs (<30 µs with option FS)
Phase Noise ( 1 GHz CW )
10 Hz offset: -80 dBc/Hz
1 kHz offset: -117 dBc/Hz
100 kHz offset: -128 dBc/Hz
10 MHz offset: -150 dBc/Hz
Remote Control (SCPI v1999)
Ethernet, USB
GPIB (with option GPIB)
Modulation
AM, FM, PM, Pulse, Chirp
Sweeps
List, Frequency, Power
Reference Input
Variable 1 MHz to 250 MHz
Reference Output
10 MHz / 100 MHz
Dimensions (W x L x H)
Weight
6.77″ x 10.63″ x 4.21″ [172 x 270 x 106 mm]
5.5 lbs [2.5 kg]
Shipping Dimensions
18x12x9″
Shipping Weight
10 lbs
Rich Set of Features in the Model 845 Series
The Model 845 Microwave RF Signal Generator also includes AM, DC-coupled, low distortion wideband-FM, PM, FSK and PSK, frequency chirp, and fast pulse modulation with an internal pulse train generator as standard. Three internal modulation sources are available, and all modulation modes can be combined. This allows the generation of complex modulation signals for modern communication and location systems.
The Model 845 is ideally suited for applications where a high-quality CW microwave source with analog modulation is required. The Model 845 operates with an ultra-stable temperature compensated 100 MHz reference (OCXO) and can be phase-locked to any external reference from 1 to 250 MHz. Additionally, the combination of pulse modulation and FM simulates Doppler effects or chirp signals. Simultaneous AM and pulse modulation provide the types of signals occurring in pulse radar applications with a rotating antenna. What’s more, the combination of FM and AM can be used to check the fading effects of FM receivers.
The Model 845 operates online or battery power making it useful for field applications or large laboratories. The Model 845 Signal Generator introduces the smallest footprint in its class.
Model 845 as External Source for Vector Network Analyzer (VNA)
App Note – Model 845 Fast Switching Speed
App Note – Pulse Descriptor Word for VSG
App Note – Automatic Leveling Correction
App Note – Mixer Measurements
App Note – How to Program Sweeps in Signal Generators
RF / Microwave To Optics Generation And Conversion
BNC Model 845 Signal Generator Datasheet v2.76
Downloadable resources such as datasheets, firmware, software, drivers and products manuals. Alternatively, you can browse resources directly by visiting our downloads page.
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The Model 845 is a small footprint benchtop Microwave Signal Generator with very high performance. The space saving packaging eliminates most of the front panel controls in favor of a software GUI that can be developed and enhanced over time. The low power requirements are equally resourceful, even allowing for a battery option.
